RFI capacitor
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Senior User
Joined: Nov 2004
Posts: 255
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From: Hephzibah Ga
RFI capacitor
I had the engine replaced in my 78 F250 and now the alternator guage keeps danceing over toward charge while I am going down the road and if I turn on the a/c and headlights it dances even more toward charge. when the truck idles it goes over to the middle where it should be. It cranks and runs fine and I checked everything I know to check. The only thing I see wrong is that the connector on the RFI capacitor is burnt into. Can anybody tell me what it's for and is that what my problem is?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The capacitor filters out high-frequency noise caused by the ignition so that it doesn't get into the radio. It's not related to your problem. I would test the alternator and regulator at a parts store (I know Autozone does both).
Moderator
Joined: Jan 2001
Posts: 56,966
Likes: 2,728
From: Virginia
Since the engine was just replaced, I would check the small ground straps that go from the engine to the firewall and any other small grounds that may have been forgotten, or may have too much new paint under them.
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